Net Loss Per Share - Computation of Earnings Per Share Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net loss	$ (9,778)	$ (42,303)	$ (24,365)	$ (56,638)
Net loss available to ordinary shareholders - basic and diluted	$ (9,778)	$ (42,303)	$ (24,365)	$ (56,638)
Denominator:
Weighted-average shares outstanding - basic and diluted	20,398,132	15,101,441	18,284,708	14,352,476
Loss per share - basic and diluted	$ (0.48)	$ (2.80)	$ (1.33)	$ (3.95)